What does it mean when you see a floater in your vision?

Seeing a floater in your vision typically means you are noticing small, dark spots or shapes that move around when you move your eyes. Floaters are usually caused by tiny bits of gel or cells floating in the fluid inside your eye. They are common and usually harmless, but if you notice a sudden increase in floaters or flashes of light, it's important to see an eye doctor to rule out any serious issues.